How to setup a backup NameServer?

/dev/rob0 rob0 at
Mon Apr 28 12:01:30 UTC 2014

On Mon, Apr 28, 2014 at 03:30:40AM +0000, houguanghua wrote:
> Does bind support backup nameserver? This nameserver isn't 
> regeristered and not accessed in normal situation. Only when
> all authority NSs is down, this backup nameserver will be
> accessed by Local DNS server.

I guess what you want is a "hidden slave", just like an ordinary 
slave nameserver except not listed as one of the NS hosts.

>  How to configure this backup NS

In the master's zone statement, you need an "also-notify" to send 
notifies to this slave. It also should be listed in your 
"allow-transfer" setting for that zone.

> and how to configure in the local DNS server?

Numerous possibilities exist there. A "type forward" or "type stub" 
or even "type slave" (where the local DNS server slaves from the 
hidden slave as its master) are among them.

The BIND 9 ARM is a very good resource. Chapter 6 is the main 
reference part, but you might find useful examples in Chapter 4.
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